package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.servicebase.exceptionHandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    public EduSubjectService eduSubjectService;

    public SubjectExcelListener() {
    }
    //创建有参数构造，传递subjectService用于操作数据库
    public SubjectExcelListener(EduSubjectService subjectService) {
        this.eduSubjectService = subjectService;
    }
//读取excel的内容 一行一行的读取
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData==null){
            throw new GuliException(20001,"文件数据为空");
        }
        //一行一行读取，每次读取有两个值，第一个值一级分类，第二个值二级分类
        //判断一级分类是否重复
        EduSubject existOneSubject = this.existOneSubject(eduSubjectService, subjectData.getOneSubjectName());
        if(existOneSubject==null){
            //没有相同的一级分类就进行添加
            existOneSubject=new EduSubject();
            existOneSubject.setParentId("0");
            existOneSubject.setTitle(subjectData.getOneSubjectName());//设置一级分类名称
            eduSubjectService.save(existOneSubject);
        }
        //获取一级分类id值
        String pid=existOneSubject.getId();
        //添加二级分类
        //判断二级分类是否重复
        EduSubject existTwoSubject = this.existTwoSubject(eduSubjectService, subjectData.getTwoSubjectName(), pid);
        if(existTwoSubject==null){
            //没有相同的一级分类就进行添加
            existTwoSubject=new EduSubject();
            existTwoSubject.setParentId(pid);
            existTwoSubject.setTitle(subjectData.getTwoSubjectName());//设置二级分类名称
            eduSubjectService.save(existTwoSubject);
        }
    }


    //判断一级分类不能重复添加
    private EduSubject existOneSubject(EduSubjectService eduSubjectService,String name){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id","0");
        EduSubject oneSubject = eduSubjectService.getOne(wrapper);
        return oneSubject;

    }

    //判断二级分类不能重复添加
    private EduSubject existTwoSubject(EduSubjectService eduSubjectService,String name,String pid){
        QueryWrapper<EduSubject> wrapper=new QueryWrapper<>();
        wrapper.eq("title",name);
        wrapper.eq("parent_id",pid);
        EduSubject twoSubject = eduSubjectService.getOne(wrapper);
        return twoSubject;

    }
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}

